diatom diathetic • Diatoma · · · Info · Definitions · Characters · · diatom · · Text Latin · · Script 6 · · Length Definitions · · · (noun) microscopic unicellular marine or freshwater colonial alga having cell walls impregnated with silica. · · Noun Definition 1 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 i latin small letter i U+0069 m latin small letter m U+006D o latin small letter o U+006F t latin small letter t U+0074